Great video! https://youtu.be/jHrjX4QTeR0?t=946 was a good moment to use a stun grenade though :) Be careful with the cover indicator too! It turns yellow if your unit is flanked! Flanked units are easier to hit! You should always try to flank your opponents before shooting at them, but be careful - if you can't kill them right away you might eat a lot of damage! It looks indeed like you are playing an older version of the game, try downloading the new one! The tank has only a 50% chance of appearing at the start of the forest though :) I'm currently working on tank battles which should make tanks REALLY fun :)